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One of the frustrating issues people can run into is floating sous vide bags. There are several things that can cause this floating, with the most common being an excess of air in the bag. Another cause is by buoyant food such as several types of vegetables or frozen chicken.
In addition to being a hassle, floating bags can also be dangerous since any of the food that is out of the water will not be held at the proper temperature. This can potentially result in unsafe conditions and bacterial growth.
The amount of floating can range greatly. Some bags might barely raise to the top of the water bath while some may fill completely with air and be so buoyant they push the top of your container off.
There are several ways you can combat the floating and some are more effective than others depending on what is causing it.
Both Costco and my butcher regularly sell meat that is prepackaged in cryovac packages, is it safe to sous vide these store bought packages? Or do I need to repackaged them before cooking? It seems like it would work fine but I wasn't sure. - Jonathan
Out of all of the questions I'm asked, this is probably the most common one! It makes sense because the allure of buying some pre-sealed meat, placing it directly in the sous vide machine, and having a great meal is so enticing. Unfortunately, as with most common questions, the answer really is "It Depends".